SNJ54LS685J

Overview

The SNJ54LS685J is a 4-bit magnitude comparator manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and features a propagation delay time of 45 ns. The device is housed in a 16-lead ceramic dual in-line package (CDIP) designed for military-grade reliability. It supports an operating temperature range from -55 °C to 125 °C, ensuring functionality in extreme environments. The component is part of the LS series, offering standard logic compatibility with low power consumption characteristics typical of the family.

Feature Summary

• Provides four-bit magnitude comparison capabilities between two binary words
• Supports cascading operations for comparing larger bit widths through dedicated expansion inputs
• Utilizes a hermetically sealed ceramic package for enhanced environmental protection

Applications

• Military avionics systems requiring high-reliability digital logic
• Industrial control units operating in extreme temperature conditions
• Data acquisition systems performing real-time value comparisons

Procurement Notes

Verify the specific suffix 'J' confirms the ceramic DIP package and military temperature rating. Ensure compliance with RoHS directives if required, as this leaded component may not meet modern environmental standards. Confirm availability through authorized distributors due to potential obsolescence status. Validate that the 45 ns propagation delay meets system timing requirements before integration.

Selection Notes

Select this component when military-grade reliability and wide temperature operation are mandatory. Compare against SNJ54S85J for faster switching speeds or SNJ54LS85J for alternative packaging options. Consider the 45 ns delay impact on high-speed circuits. Verify pinout compatibility with existing board layouts designed for standard 16-pin DIP footprints.

Part Context

This device belongs to the Texas Instruments SN54/74LS series of logic integrated circuits. The SN54 variant denotes military qualification, distinguishing it from commercial SN74 counterparts. It serves as a fundamental building block for arithmetic logic units and decision-making circuits in complex digital systems requiring robust performance under harsh conditions.

Replacement Considerations

SNJ54S85J offers similar functionality with improved speed specifications. SNJ54LS85J provides a direct functional equivalent potentially available in different package configurations. Verify pin compatibility and electrical parameters before substituting any alternative part numbers.